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Co2NiO4

High-Entropy Materials HEA Traditional Materials TRA

MP-ID: mp-1096547 · Space group: Fd-3m (#227)

Basic Information

Formula
Co2NiO4
MP-ID
mp-1096547
Elements
3
Sites
14
Density
5.9051
g/cm³
Volume
135.29
ų
Cell a
5.8077
Å
Cell b
5.8077
Å
Cell c
5.8077
Å
α Angle
58.98
°
β Angle
58.98
°
γ Angle
58.98
°
Space Group
Fd-3m
Point Group
m-3m
Crystal System
Cubic
Bravais Lattice
Cubic F
Stability
No
Packing Fraction
0.7400

X-ray Diffraction

Diffraction Pattern
X-axis: 2θ (°); Y-axis: relative intensity; CuKa ; λ=1.5406 Å
Diffraction Peaks (Top 24)
2θd (Å)Ihkl
18.57 4.7782 6.0 (1,1,1)
18.96 4.6804 17.4 (1,0,0)
30.80 2.9032 33.9 (2,1,1)
31.29 2.8589 32.2 (1,0,-1)
36.20 2.4811 53.8 (2,2,1)
36.63 2.4533 100.0 (2,1,0)
36.84 2.4398 33.2 (1,-1,1)
36.84 2.4398 16.6 (1,1,-1)
37.65 2.3891 5.6 (2,2,2)
38.47 2.3402 15.4 (2,0,0)
44.48 2.0370 23.4 (2,0,2)
44.48 2.0370 11.7 (2,2,0)
54.46 1.6849 5.2 (3,3,2)
55.38 1.6590 7.1 (3,0,1)
55.38 1.6590 3.5 (3,1,0)
55.69 1.6506 3.4 (2,-1,-1)
55.69 1.6506 1.7 (1,1,-2)
57.90 1.5928 2.8 (3,3,3)
58.49 1.5780 11.2 (3,1,3)
58.49 1.5780 5.6 (3,3,1)
58.93 1.5672 22.0 (3,0,2)
58.93 1.5672 11.0 (3,2,0)
59.23 1.5601 18.3 (2,-1,2)
59.23 1.5601 5.3 (2,2,-1)
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Energy Properties

Formation Energy/atom
-1.03977
eV/atom
Energy/atom
-6.73103
eV/atom
Energy above Hull
0.1887
eV/atom
Uncorrected Energy
-5.5075
eV/atom
Volume/atom
9.66
ų
c/a Ratio
-

Electronic Properties

Metallic
Metal
Band Gap
0
eV
Direct Gap
No
CBM
N/A
eV

Magnetic Properties

Magnetic
Yes
Total Mag. Moment
13.9932
μB
Mag. Ordering
FM
Mag. Sites
6
Magnetization/Volume
0.103430
μB/ų

Elastic Properties

Elastic data not available

Feature Analysis

Composition Overview

Element Composition (atomic fraction)
Composition Info
Major / Matrix Element
O · 0.571
Element Family
Metalloid-Nonmetal
Solute Fraction
0.429
Interstitial Fraction
0.000

High-Entropy Alloy Features

Composite Radar (normalized)
Element-Class Share
Mix Entropy ΔS/R
0.9557
HEA criterion (>1.0 = high entropy)
Mix Entropy ΔS
7.9457
J/mol·K
Ω Parameter
0.0000
Ω > 1.1 favors solid solution
Atomic Size Mismatch δr
36.486%
δr < 6.6% favors single-phase solid solution
Electronegativity Diff Δχ
0.7671
smaller = more stable mixing
VEC
6.286
valence electron concentration, affects phase stability
Mix Enthalpy ΔH_mix
0.000
kJ/mol; negative = exothermic mixing
Entropy Norm
0.8699
SS Former
0
Phase Tendency
IM

Traditional Material Features

ROM Blended-Feature Radar
Rating & Classification
Tier
C
Score
0.436
Family
O-rich Multi-Component
Matrix Element
O · 0.571

Related Tasks

Related computation task IDs (2)

Citation & References

Materials Project Page
https://materialsproject.org/materials/mp-1096547
Reference Citation

The crystal structure and related material properties of Co2NiO4 were obtained from the Materials Project database (MP-ID: mp-1096547, database version v2026.04.13).

Literature Citation

Horton, M.K., Huck, P., Yang, R.X. et al. Accelerated data-driven materials science with the Materials Project. Nat. Mater. 24, 1522–1532 (2025). https://doi.org/10.1038/s41563-025-02272-0

BibTeX
@article{Horton2025,
  author  = {Horton, Matthew K. and Huck, Patrick and Yang, Ruo Xi and Munro, Jason M. and Dwaraknath, Shyam and Ganose, Alex M. and Kingsbury, Ryan S. and Wen, Mingjian and Shen, Jimmy X. and Mathis, Tyler S. and Kaplan, Aaron D. and Berket, Karlo and Riebesell, Janosh and George, Janine and Rosen, Andrew S. and Spotte-Smith, Evan W. C. and McDermott, Matthew J. and Cohen, Orion A. and Dunn, Alex and Kuner, Matthew C. and Rignanese, Gian-Marco and Petretto, Guido and Waroquiers, David and Griffin, Sinead M. and Neaton, Jeffrey B. and Chrzan, Daryl C. and Asta, Mark and Hautier, Geoffroy and Cholia, Shreyas and Ceder, Gerbrand and Ong, Shyue Ping and Jain, Anubhav and Persson, Kristin A.},
  title   = {Accelerated data-driven materials science with the Materials Project},
  journal = {Nature Materials},
  year    = {2025},
  volume  = {24},
  number  = {10},
  pages   = {1522--1532},
  month   = {oct},
  doi     = {10.1038/s41563-025-02272-0},
  issn    = {1476-4660},
  url     = {https://doi.org/10.1038/s41563-025-02272-0},
  abstract = {The Materials Project was launched formally in 2011 to drive materials discovery forwards through high-throughput computation and open data. More than a decade later, the Materials Project has become an indispensable tool used by more than 600,000 materials researchers around the world. This Perspective describes how the Materials Project, as a data platform and a software ecosystem, has helped to shape research in data-driven materials science. We cover how sustainable software and computational methods have accelerated materials design while becoming more open source and collaborative in nature. Next, we present cases where the Materials Project was used to understand and discover functional materials. We then describe our efforts to meet the needs of an expanding user base, through technical infrastructure updates ranging from data architecture and cloud resources to interactive web applications. Finally, we discuss opportunities to better aid the research community, with the vision that more accessible and easy-to-understand materials data will result in democratized materials knowledge and an increasingly collaborative community.}
}

3D Crystal Structure Rendering

Loading 3D structure…

Style: Ball & Stick
Raw CIF Data
# generated using pymatgen
data_Co2NiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.80771930
_cell_length_b   5.80771930
_cell_length_c   5.80771957
_cell_angle_alpha   58.97909506
_cell_angle_beta   58.97909506
_cell_angle_gamma   58.97910362
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Co2NiO4
_chemical_formula_sum   'Co4 Ni2 O8'
_cell_volume   135.29055153
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Co  Co0  1  0.00000000  0.00000000  0.00000000  1.0
  Co  Co1  1  0.00000000  0.50000000  0.00000000  1.0
  Co  Co2  1  0.50000000  0.00000000  0.00000000  1.0
  Co  Co3  1  0.00000000  0.00000000  0.50000000  1.0
  Ni  Ni4  1  0.62515200  0.62515200  0.62515200  1.0
  Ni  Ni5  1  0.37484800  0.37484800  0.37484800  1.0
  O  O6  1  0.23331100  0.23331100  0.23331100  1.0
  O  O7  1  0.23538800  0.79156900  0.23538800  1.0
  O  O8  1  0.79156900  0.23538800  0.23538800  1.0
  O  O9  1  0.23538800  0.23538800  0.79156900  1.0
  O  O10  1  0.76668900  0.76668900  0.76668900  1.0
  O  O11  1  0.76461200  0.20843100  0.76461200  1.0
  O  O12  1  0.20843100  0.76461200  0.76461200  1.0
  O  O13  1  0.76461200  0.76461200  0.20843100  1.0
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